We extend our previous work on the age-chemical abundance structure of the Galactic outer disc to the inner disc (4 < r < 8 kpc) based on the SDSS/APOGEE survey. Different from the outer disc, the inner disc stars exhibit a clear bimodal distribution in the [Mg/Fe]-[Fe/H] plane. While a number of scenarios have been proposed in the literature, it

The tight correlations between supermassive black hole (SMBH) mass (M BH) and the properties of the host galaxy have useful implications for our understanding of the growth of SMBHs and of the evolution of galaxies. Here, we present newly observed correlations between M BH and the host galaxy total UV-[3.6] color ( ${{ \mathcal C }}_{\mathrm{UV}

We study the dynamics of plasma along the legs of an arch filament system (AFS) from the chromosphere to the photosphere, observed with high-cadence spectroscopic data from two ground-based solar telescopes: the GREGOR telescope (Tenerife) using the GREGOR Infrared Spectrograph in the He I 10830 Å range and the Swedish Solar Telescope (La Palma)

The optical design has been updated to include an Adaptive Secondary Mirror that becomes part of the Multi-Conjugated Adaptive Optics (MCAO) system. This new concept allows simplifying the optical design reducing the number of optical surfaces before the instrument suite. The project has also announced a call for tenders for the Preliminary Design

Low-mass extremely metal-poor (EMP) stars formed from a mixture of material of the primordial nucleosynthesis and matter ejected from the first supernovae. The chemical composition of EMP stars, especially those still on the main sequence, holds crucial information on the properties of the first stars, the first supernovae and the early chemical

The GTC Adaptive Optics (GTCAO) system will provide diffraction-limited capabilities in the near infrared to the GTC telescope. At first, it will use a Natural Guide Star (NGS) as a reference source, and later it will be upgraded to a Sodium Laser Guide Star (LGS), which will significantly increase the sky coverage. The GTCAO system is expected to